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An adaptive fault-tolerant event detection scheme for wireless sensor networks.
1Department of Computer Engineering, Hongik University, 72-1 Sangsu-Dong, Mapo-Gu, Seoul, Korea. yimsungjib@gmail.com
Sensors (Basel, Switzerland)
|February 2, 2012
Summary
This study introduces a fault-tolerant event detection scheme for wireless sensor networks (WSNs). It maintains high accuracy and low false alarms even with 50% faulty nodes, minimizing communication overhead.
Area of Science:
- Computer Science
- Electrical Engineering
- Network Engineering
Background:
- Wireless sensor networks (WSNs) are susceptible to node failures and transient sensor faults.
- Event detection in WSNs requires robust schemes to maintain accuracy and reliability despite these challenges.
- Existing methods often struggle with high fault rates or significant communication overhead.
Purpose of the Study:
- To develop an adaptive fault-tolerant event detection scheme for WSNs.
- To enhance the reliability and accuracy of event detection in the presence of faulty sensor nodes.
- To minimize communication overhead during the event detection process.
Main Methods:
- Implemented a distributed event detection approach where nodes use neighbor readings.
- Incorporated confidence levels for dynamic threshold adjustment to adapt to faulty nodes.
- Utilized a moving average filter to mitigate transient sensor reading faults.
- Optimized data exchange to only three bits per node to reduce communication overhead.
Main Results:
- The proposed scheme demonstrates consistent performance with up to 50% faulty nodes.
- Event detection accuracy remained high, and the false alarm rate remained low.
- The moving average filter effectively reduced the impact of transient faults.
- Minimal communication overhead was achieved due to the efficient data exchange protocol.
Conclusions:
- The adaptive fault-tolerant scheme significantly improves the robustness of event detection in WSNs.
- The dynamic threshold adjustment and fault tolerance mechanisms are effective against node failures.
- The scheme offers a practical solution for reliable event detection in challenging WSN environments with reduced communication costs.
